Brake



May 7, 1929.

E. G. L. KINDLER BRAKE Filed Jan. 4, 1925 Fig. 5.

2 Sheets-Sheet 2 I Patented May 7, 1929.

UNITED STATES EDUARD G. L. KINDLER, OF FRIEDENAU, NEAR BERLIN, IBERGISCHE STAHL-INDUSTRIE, OF OBERKASSEL, NEAR GERMANY, 'ASSIGNOR 'ro DUSSELDORF, GERMANY.

BRAKE.

Application filed January 4, 1926, Serial No.

This invention relates to friction-brakes for railroad cars or other vehicles travelling on rails and consists essentially therein that the brake-shoes are applied to a brake-disc which is mounted in radial direction upon an axle of the vehicle, and that a layer of yielding material, such as Ferodo-fiber, wood or the like, is inserted between said brake-shoe and said brake-disc, said layer serving as the .element of the brake which is exposed to wear. The brake in the present case will act in axial direction upon said brake disc. The yielding layer is preferably mounted upon the brake-shoe by having a plate or disc of sheetmetal interposed, to which said yielding layer is fastened by means of rivets or the like. The rivets, serving for fastening the yielding layer upon said plate or disc of sheetmetal, are preferably made of copper and arranged counter-sunk, and with heads of conical conformation. The brake-disc, which is mounted in radial direction upon the axle, is preferably polished at its surface which cooperates with the yielding layer of Ferodo-fiber or the like. A rough braking surface of the brake-disc has been found to cause an excessive wear of the layer which serves as the brake-shoe or brake-block proper. In case a brake-disc is used, which is acted upon by the brake-shoe on both of its sides, this brake-disc is preferabl constructed as a double disc, the means or fastening said double disc upon the axle being then preferably provided between the two individual discs of which the double brakedisc is composed. If such a double brakedisc is used, preferably both outer surfaces of the disc are smoothly polished. It is further desirable that the lever mechanism of the brake, which is used for transmitting the forces from the actuating handle for the brake to the braking organs, is positioned in proximity to the latter. For this purpose preferably two double leversare employed which are arranged in such a manner that they will be positioned crosswise with respect to each other, the lever arms which act upon the brake-shoes being essentially shorter than the lever arms which are connected with the operating mechanism of the brake. Thus the lever mechanism will consist of two double levers of the form of bell-cranks, each comprising a shorter arm connected with the brakeshoe and a longer arm connected with the operating mechanism of the brake, whereby 79,191, and in Germany November 28, 1925.

said longer arms are arranged in crosswise manner. The lever mechanism is preferably mounted upon a support, which is suspended from the frame of the car. The ends of the longer arms of the bell-cranks areconnected with each other by a string or chain which is carried over a roller, the latter being connected with the operating mechanism of the brake. The brake-shoes, which are operated by the shorter arms of the bell-cranks, are preferably loosely mounted upon the latter and are pressed away from the brake-disc by means of springs, which are mounted within a casing and laid around a pressure pin for the brake-shoes.

The drawing represents an example of the brake constructed according to this invention.

Fig. l is aside-view of the new brake,

Figs. 2 and 3 a top-view and front view respectively, taken on Fig. 1,

Fig. l a diagrammatic view representing the general arrangement of the brake and Fig. 5 a section representing in approximately natural size the mode of fastening the layer, which serves as the brake-member proper, on the brake-shoe,

Fig. 6 shows a section of a part of the brake on a large scale.

In the drawing the reference letter a des-' lgnates two discs, which are connected with each other by the Walls or webs a. In order to faciltate the mounting of said discs a upon the axle, the former are made of two' halves, which are connected with each other by means of the screw-bolts b in such a-manner, that said screw*bolts will be positioned between the two discs a. i The discs a are smoothly polished on their exterior surfaces. The several parts of the discs a. are constructed and connected with each other in such a manner that there will be no axial motion of the one disc relatively to the other. The layer 0 serving as the braking member proper is made of a material ofgreat resistance to wear and more yielding than metal, such as Ferodo-fiber, wood or the like, and is fixed upon the plate or disc 0 of sheet-metal by means of counter-sunk rivets 0 as shown in Fig. 5, while the plate or disc 0 is fixed to the brakeshoe 0 by means of the screw-bolts 0 The brake-shoe pin 0 is surrounded by a helical spring a, as shown in Fig. 2- The threaded pin 0" serves for adjusting the effective length of the brake-shoe pin a. l he bell-cranks d 25 double lever.

40 lengths of the two arms 60 brake operating 1 tially in the direction of said axle, 65 crank lever for each shoe arranged to swing 5 the brake-shoe pins and therewith upon the brake-shoes. The chain h is connected with one of its ends to the end of the longer arm of one of the bell-cranks and is carried over the roller 2', while the other end of said chain is connected to the end of the longerarm of the other bell-crank. Thus, in case of a different wear of the brake layers 0, the arrangementcof the chain It will provide a compensation for the difference of the effective lengths of the two arms of one or both of said bellcranks. The double lever is, as shown in Fig. 4, serves as the operating handle for the brake, the forces for operating the brake being applied at the ends we of said double lever is either by the hands of the driver or by means of an electrically actuated solenoid or the like. On the double lever 70 there are further provided rollers 0 at positioned near the point of rotation of said The rollers i are connected with each other by a flexible string a or the like, rollers 0 in of the drawing.

the manner indicated in Fig. 4 The stringm will also be able to provide a compensation for unevenwear of the layers 0, the-same as the chains h.

reason of the fact that the points of rotation of the rollers o are positioned relatively closely to the point of rotation of the double lever k, the first force-increasing lever action of the operating mechanism of the brake will take place at the rollers 0 while a further force-increasing lever action will take place at the bell-crank 01 due to the different thereof. The pivot (not shown) of the lever 70 is supported by the under frame of the vehicle. The spring 0 is fully enclosed in a casing 71, so that said spring will be fully protected against soiling.

The support 7 which serves as a bearing for the brake-shoes 0* and the. bell-cranks d is mounted by means of the arms q in suspended condition on the bottom or underframe of the car, as may especially be seen from Fig. 3. By this a relative motion between the brakeshoes 0 which carry the layer a, and the discs 11 will bemade possible in perpendicular direction. A bar '7' is connected to the under frame of the car and serves as an abutment for the support, thus preventing the support andbrakev shoes from swinging away from the disc.

I claim 1. In a friction brake for rail vehicles, a device, a brake disc radially mounted on a rotatable axle of the vehicle, a I brake shoe opposite each lateral surface of the said disc and arranged to move subsltalripoints, which are which is carried over and between saidin a plane perpendicular to the said surface,

one arm of each lever acting on a brake shoe,

2. In a friction brake for rail vehicles, a

brake operating device, a brake disc radially mounted on a rotatable axle of the vehicle, a brake shoe opposite each lateral surface of the said cam disc and arranged to move substantially in the direction of said axle, a bellcrank lever for each shoe arran god to swing in a plane perpendicular to the said surface, one arm of each lever acting on a brake shoe, the other arm being connected with the said brake operating device, the levers actuating the brake shoes only in their engaging direction, the arms of the lovers which are in connection with the said brake operating device being longer than the other arms and crossing each other. p

3. In a friction brake for rail vehicles, a brake disc mounted radially. on a rotatable axle of the vehicle, a brake shoe opposite each lateral surface of the said disc and arranged to move substantially in the direction of the said axle, two levers each' adapted toact on a brake shoe, means for moving the said levers, the free ends of the said levers being arranged to be engaged by said means, and a device for compensating uneven wear of both of said brake shoes and for effecting an equal distribution of the braking forces to the said levers.

4. In a friction brake for railvehicles, a

brake disc mounted radially on a rotable axle of the vehicle, a brake shoe opposite each lateral surface of the said disc and arranged to move substantially in the direction of the said axle, two leverseach adapted to act on a brake shoe, means for moving the said levers,

the free ends of the said levers being arranged to be engaged by said means, and a device for .ly mounted on a rotatable axle of the vefriction brake for rail vehicles, a i .120

hicle, a brake shoeopposite each lateral surface of the said disc and arranged to move substantially in the direction of said axle, a

bell-crank lever for each shoe arranged to swing in a plane perpendicular to the said surface, one arm of each lever acting on a brake shoe, the other arm being connected with the said brake operating device, the levers actuating the brake shoes only in their engaging direction, means for guiding each brake shoe, and a member connecting the guiding means of the brake shoes.

6. In a friction brake as claimed in claim 1, means for guiding each said brake shoe, a member connecting the guiding means of the twobralce shoes, and suspending means for suspending said member to the underframe of the vehicle and permitting a swingin r movement of the member.

I. In a friction brake as claimed in claim 1, means for guiding each said brake shoe, and a member for connecting the guiding means of the said two brake shoes, the pivots of the said levers being arranged on the said member.

8. In a friction brake for rail vehicles, a

brake operating device, a brake disc radially mounted on a rotatable axle of the vehicle, a brake shoe opposite each lateral surface of the said disc and arranged to move substantially in the direction of said] axle, a bell-crank lever for each shoe arranged to swing in a plane perpendicular to the said surface, one arm of each lever acting on a brake shoe, the other arm being connected with the said brake operating device, the lovers actuating the brake shoes only in their engaging direction, means for guiding each brake shoe, and a member for connecting the guiding means of the two brake shoes, the pivots of said levers being arranged on the said member and near the guiding means of the respective brake shoes.

9. A friction brake for rail vehicles, com prising a brake disc mounted rotatably but not slidably on a rotatable axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means moved in the same direction as'the brake shoes and to take with it the brake shoes only in one direction of movement, a pin on each brake shoe adapted to be engaged by the said means.

10. A friction brake for rail vehicles, comprising a brake disc mounted radially on a rotatable axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means for each shoe moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, a spring for releasing each brake shoe from the said brake disc and tensioned by said means.

11. A friction brake for rail vehicles, comprising a brake disc mounted radially on a rotatable axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means for each shoe moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, a spring for releasing each brake shoe from the brake disc and tensioned by-said means, and a casing for guiding each brake shoe, the said spring being enclosed in said casing.

12. A friction brake for rail vehicles, comprising a brake disc mount-ed radially on a rotatable axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, a pin on each the direction of said axle against one of the lateral'surfaces of the said disc, and means for each shoe moved in 'the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, and a layer of yielding material interposed between each brake shoe and said brake disc.

14. A friction brake for rail vehicles, comprising a brake disc mounted radially on a rotatable axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means for each shoe moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, and a layer of yielding material mounted on each brake shoe.

15. A friction brake for rail vehicles, comprising a brake disc mounted radially on a rotatableaxle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means for each shoe moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, a layer of yielding material mounted on each brake shoe, and the surface of said disc co operating with said brake shoes being polished before use; 16. A friction brake for rail vehicles, comprisin a brake disc mounted radially on a rotata le axle of the vehicle, two brake shoes each arranged to be moved substantially in the direction of said axle against one of the lateral surfaces of the said disc, and means moved in the same direction as the brake shoes and to take with it the brake shoes only in one direction of movement, ala er of ielding material on the braking su ace 0 each brake shoe, the disc comprising two disc shaped bodiesspaced apart and means within the space between the inner surface of the said bodies for bracing the latter against each other.

17. In a friction brake for rail vehicles, a brake operating device, a brake disc radially mounted on a'rotatable axle of the vehicle, a brake shoe opposite each lateral surface of the said disc and arranged to move substantially in the direction of said axle, a bell-crank lever for each shoe arranged to swing in a plane perpendicular to the said surface, one arm of each lever acting ona brake shoe, the other arm being connected with the said brake operating device, the levers actuating the brake shoes only in their engaging direction, a layer of yielding ma terial on the braking surface of each brake shoe, the disc being composed of two bodies each comprising two semi-circular plates spaced apart, means between the inner surfaces of the said plates for bracing the discs against each other and other means within the said space for fastening the said bodies together to form a compact member of discwheel form.

18. A friction brake for rail vehicles, comprising two brake surfaces fastened radially and not slidably on a rotatable axle of the vehicle, two brake shoes, each opposite one of said brake surfaces and arranged to'berection of movement,

19. A friction brake for railway vehicles, comprising a brake disc mounted radially on a rotatable axle of the vehicle, a brake shoe arranged opposite each lateral surface of said disc, .each shoe arranged to be moved substantially in the direction of said axle against the disc, and means for each shoe moved in the same direction as the shoes to take its shoe with it only in one direct-ion.

20. A friction brake according to claim 19, wherein said means comprises a bell crank lever arranged to swing in a plane perpendicular to the friction face of a shoe,'and a brake operating device, one arm of said lever moving the shoe and the other arm connected with said device.

In testimony whereof I afiix my signature.

EDUARD G. L. KINDLER. 

